$\frac{d^{25}}{dx^{25}}\left(x\cdot\cos\left(x\right)\right)$
$4x-4=5x-8$
$\left(b^m\right)^2$
$\left(x^3-7x^2+5x\right)-\left(9x^4-4x^2+8x+12\right)\:$
$\left(x-\frac{2}{3}\right)^2$
$8a^{x+2}b^{x+3}-25a^{x+2}b^{x+3}$
$x^4+4x^2-45$
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